Preheat oven to 390. Put liners into muffin tins.

In a large bowl blend flour, oats, salt, sugar, and baking soda. Mush in the butter with your fingers (great thing to do with kids!). When well combined, add in the mix of nuts and dried fruit. Add in buttermilk and stir until just combined with a wooden spoon. Distribute the batter amongst your muffin tins. (NOTE: If you want really big ones, you could distribute just amongst 6 or 8 cups, but if you want smaller ones, say for lunches for little kids, all 12 would work well.)

Bake for 20 minutes. Let muffones cool on cooling rack. Eat or freeze for later use.